Synopsis of the species of Cheilolejeunea (Marchantiophyta, Lejeuneaceae) in the Pacific dominion and Páramo province of tropical America Author Gil-Novoa, Jorge Enrique Programa de Pós-graduação em Botânica, Escola Nacional de Botânica Tropical, Instituto de Pesquisas Jardim Botânico do Rio de Janeiro. Rua Pacheco Leão, Horto, 2040, 22460 - 080, Rio de Janeiro-RJ, Brazil. & Grupo Sistemática Biológica, Herbario UPTC, Universidad Pedagógica y Tecnológica de Colombia, Tunja, Boyacá, Colombia. Author Costa, Denise Pinheiro 0000-0001-9495-3029 Instituto de Pesquisas Jardim Botânico do Rio de Janeiro - IPJBRJ, Rua Pacheco Leão 915, 22460 - 030, Rio de Janeiro, RJ, Brazil. denisepinheirodacosta @ gmail. com; https: // orcid. org / 0000 - 0001 - 9495 - 3029 denisepinheirodacosta@gmail.com text Phytotaxa 2023 2023-03-14 587 2 73 120 http://dx.doi.org/10.11646/phytotaxa.587.2.1 journal article 10.11646/phytotaxa.587.2.1 1179-3163 7731813 18. Cheilolejeunea lineata (Lehm. & Lindenb.) Schiffner (1893: 124) .— Jungermannia lineata Lehm. & Lindenb. ( in Lehmann 1832: 53 ). Type :—”Bourbon”, Bory de St. Vincent s.n. (?) (not seen).— Fig. 12J–R . Plants light brown, 1.3–2 mm wide. Stems 120–140 µm in diameter, (7–)8 epidermal cells in cross section, 17–26 × 8.5–13.5 µm; (9–)11–15 medullary cells, 9–16 × 5–11 µm. Ventral merophytes 2 cells wide. Leaves imbricate, ovate, convex, 900–1100 × 600–650 µm; margin commonly entire or crenulate by mammillose cells; apex broadly rounded, dorsal margin curve; papillose on the dorsal side, conspicuous trigones; basal cells 36–54 × 13–23 µm, median cells 26–35 × 17–20 µm, marginal cells 7–17 × 8–11 µm. Lobule globose, 1/4–1/3 of leaf length, free margin strongly involute, keel curved. Underleaves distant, orbicular, 280–300 × 240–360 µm, 2–3 × stem width, bifid to 1/4–1/3, with sinus acute, margin entire, base cuneate. Dioicous. Androecia commonly on the main stem, or at the apex of the branches, 4–6 pairs of bracts. Gynoecia on branches without innovations, bracts obovate, 700 × 550 µm, apex acute. Perianth without keels, without beak. Vegetative reproduction unknown. Distribution and habitat :—Neotropical, occurring in Puerto Rico , Dominica , Costa Rica , Colombia , and Brazil ( Bastos 2017 ). This species grows associated with tree trunks and branches in the study area, in lowland and lower montane rainforests, between 30–1850 m in the Guatuso-Talamanca, Puntarenas-Chiriquí, Magdalena, Cauca, and Chocó-Darién provinces of the Pacific dominion. The record of C. lineata occurring in the Páramo ( Fig. 13 ), actually belongs to the Cauca province. Notes :—The species is characterized by the peculiar shape of the lobule, which is fully orbicular and has a fully rolled margin, in addition to bulging cells reflective of the mammillose cells. Cheilolejeunea lineata was originally described from Réunion (“Bourbon”), without citation of a collector ( Lehmann 1832 ). In a discussion of the type, Bastos (2017) suggested that the original material might have been collected by Bory de St. Vincent . The type should be in S (hb. Lehmann) and perhaps in W (hb. Lindenberg), and has not been seen; a duplicate, from the Lehmann herbarium, is housed at G (00283421!). Evans (1906) suggested an error in the original citation of the type locality as the range of the species seemed restricted to the West Indies (see also Grolle 1995 ). Although he did not select a lectotype , Evans (1906) cited material from Puerto Rico collected by Schwanecke and by Sintenis (erroneously cited by Bastos 2017 as “Tipo”) and four collections made by himself at El Yunque ( Evans 38, 46, 62, 99 ), some of which are housed in NY. Clearly, a study of the type material of C. lineata is necessary. The currently known distribution for the species is Central America, West Indies, and South America ( Colombia and Brazil ). Specimens examined :— COLOMBIA . Antioquia : Guatapé , 6°14’N , 75°10’W , 1850 m , 13 June 1997 , Gutierrez 1183, 1280 ( HUA ) . Chocó : Road Santa Cecilia – Tadó 200 m , 1 August 1992 , Gradstein 8741 ( COL ) ; Biological Station “El Amargal” at the Pacific coast S of Nuqui , 30 m , 6 August 1992 , Gradstein 8853, 8897 ( COL ) . COSTA RICA . Puntarenas : Osa Peninsula , 250–300 m , 31 October 1993 , Gradstein 9355 ( COL ) .